Gas-engine.



W. E. BROWN.

GAS ENGINE,

AYPLICATION FILED MAR.23,1912- 1,117,319, Patented Nov. 17, 1914.

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A T TURNED 5'.

. the crank case as with ordinary two 037.01 3 7 engines and to introduce the charge V UNITED snares re inish WILLIAM E. BROWN, OF MILWAUKEE, WISCONSIN ASSIGNOE D QX'E'QEEaL'E WILLIAIii M. STEWAB'Z, OF MIL'WAUKEE, VJISQO'KPEE.

GAS-ENQIHE.

s amen or we" Patent. Petencerrnoififiis,

Application mac mmn'ae, 1am. sem in; stem;

other than the piston itself and its OfifiPSlM- ing portsin the walls of the cylinzier.

Anotherobject of theinventien is to dip pene with the compressionoffthe charge; in

compression into one end of; the combustion chamber while exhausting the burnt st the op oeite'en'd of the comhustionchemhen Witii the above and other objects in view the invention consists in the as engine as herein: claimed and all equive enter: In the accompanying drawing the view is a sectional'elevatiom of it two cycle engine constructed in accordance with this inventionithough the inventionis' not confined to an engine of two c'ylind ,ars.; v

In these drawings 10 indicates theengine cesin' in which the usual crenlx'shsft 11 is prov; ed with the flywheel 12 and the com necti'ng rods 13, but without cams. The connecting rods 13 connect with pistons 14 which slidsbly lit in c'ylindem L5- The pistons and the cylinder however, are not of the ordinary type, for each piston. has at cylindrical 'extenaionle {owning its upper portion of the same-diemeteri-es its lower ortion and terminating in en outwardly extending tier e forming'atrunlz piston 17 .withln e eylin r extension 13 'ontop ofthe cyliucli: 16. The cover or cylinder-heed l9 for the-extension -18 of each oylin'er has a ii'ownwardly extending h'eliew plunger 20 fitting within the interior of the piston extension 16 forming e stationery plunger within a movable cylinder. she spam within the piston extension 16 and between the stationary plunger 20 and the piston proper 14 constitutes a combustion chamber 21 and a spark plug 22 passing through the stationary plunger 20 serves to igmtejhe charge of explosive gas within thi'soom hustion chamber.

1.1 the drawing the new at the in; a? e its extreme upper position while the p at the rightis at its extreme lower we The piston members: have mcosssn around their intermediate portions which in the uppermost position of the. pistfm register with a series of int-sire port; the wells of th eylinci'erenci with the 121-" terior of the cylinier: extension 18313930? the trunk piston 17 which space will/here {erred to as the compression Gl18mbi.' '?5.

As the result of this. connection-the partial vacuum reduced in the compreinien-cham "her 25 y the upwiitti movement "oi "the trunk piston 17 causes achsrge oi .sxplo siv mixture to be drawn into thoompmegionchamber 535 irom an intake. assegeway oinfitl surrounding the cylinders en connected fwith a carburetor not showma This charge is compressed n the. compressionchamher -2 5 during they-downward movement-oi the piston and until a series of portozdls-inithe iston extension 16; ass helowrthepiungi-rti end 20 as at theirig tofthe-dreiving. when the compressed charge in the eempressigg chamber 25 enters the combustion chanztmr 21 through said orts 27.1 v This ioreibleegb mission of the "reshchen st the-upper? end of the combustione ernhsrythrcngh numerous ports 27 reflective-iv.- scavenges the combustion chamber driving the-,5 burnt gases downwardly end out through ports 28 at the bottom of thecr-nibnstion chamber which at this time register with exhaustports 29 atv the lower end of t'ne eyliriiier ssgeway 30 surroi znding the syiinicrs end have an exhaust pipe connection not shown;

In order that the trunk pint-one if?v nmy thereof thus causing the air current to travel close to the heated plur- Iormmg one wall of the her. in addition to this the "which communicntesrwitlzsu exhaust-perv on opposite'sides of that wn1.-: of tits plunger serves to keep-t em cool and as the walls ofthe iston extension 16 travel in contact therewith the air serves to assist in cooling them.

v In operation the engine acts ass two cycle engine the charge under compression being admitted to the upper end of the combustion chamber-, however, and driving tha'burnt gases out of the lower end of the combustion chamber, thus assuring a more complete exchange of fresh explosivemix'ture for burnt gases without their commingling to impair the effectiveness of the following explosion. Furthermore these results are accomplished without the lisejof valves other than those formed by the openings in the piston registering with openings m'the-cyhnder. If it is found diflicultto start the engine by reason oi the suction produoedby one trunk iston 17 before the compression chamber In which it iscontained communicates with the intake ports and by reason of the compression produced by the'other trunk piston 17 before the compression chamber in which it is located communicates with-the combustion chamber pet cocks 33, preferably in the form of ordinary priming valves may be provided in thewalls of the cylinder extension 18 approximately midwa the length of the stroke of the trunk piston 17 and these valves may beleft open to relicve such suction and compression during part of the stroke of the piston and thus facilitate the starting" of the engine when the valves may 'be'closed. By removing the cylinder heads 19 the plungers 20 are withdrawn and the entire interior of the engine becomes accessible for cleaining or repairing while the spark plugs 22 are accessible at all times through the openings of the cylinder heads.

:VVhat I claim as new and desire to secure by Letters Patent is:

1. A two cycle engine, comprising a cyl inder, a cylindrical piston operating therein, a stations plunger fitting within the cylindrical piston and forming a combustion chamber in the interior thereof, an extension on. the cylinder of larger diameter, a flange on the piston forming a trunk piston in the extension of the cylinder and. constituting .with the cylinder extension a compression m;aaiceiav t ew-being ports in the istofl caring the'plunger at the end of t e explosion stroke of the piston for establishing communication between the compression chamber and the combustion chamber, there being ports in the piston at the other end of the combustion chamber uncovered at the end of the explosion stroke of the piston throu h which the exhaust gases may be force by theincoming compressed charge from the com ression chamber, and an intake port on t c cylinder, there being a recessin the piston connecting the intake ort with the compression chamber at the on of the compression stroke of the piston.

2, A two c ole-gas engine, comprising a I cylinder, a cy indrical' piston workin therein, anextensionon the cylinder 0 larger diameter, a flange on the piston forming a trunk piston working within the extension cylinder to form a compression chamber, a cylinder head on the cylinder-extension having acentral o ning; a plunger projecting from the cylin or head and working within the'cyli'nd-rical piston and forming a combustion chamber in the interior thereof, there being orts in the piston clearing the plunger at e end of the explosion stroke of the piston connecting the compression chamber with 'the combustion chamber,-an exhaust passageway in the cylinder, there being a port m the piston communicating with the exhaust passageway at the end of the explosion stroke of the piston an intake passageway in the'cylinder, there being a recess in the piston connecting the intake passagewa with the compression chamber at the en of the compression stroke of the piston, said plunger being rovided with openings above the trunk piston, a spark plug in the giunger, and a tubular deflector rolecting rom the cylinder head to near the and o the plunger to cause the air forced through said openings to travel close to the walls of the plunger.

In to timony whereof, afiix my signature, in presence of two witnesses. 

